1/35 scale. World War I Heavy Tank Mark IV Tadpole. Takom. The Mark IV was a British tank of World War I. Introduced in 1917, it benefited from significant developments on the first British tank, the intervening designs being small batches used for training and was first used in large numbers on 7 June 1917, during the British assault on Messines Ridge. In an attempt to improve trench-crossing capability, the tadpole tail, an extension to the rear track horns, was introduced. Kit features highly detailed exterior with rivets, front armor plate with exterior detail, Commander's and Driver's visors lookout hatch are separate, pistol ports molded in the closed position, detailed running gear with exhaust system, easy assembly individual link workable track, detailed 6pdr gun with separate breech block, 7.62mm Lewis guns with traverse and elevation, stowage box, rear doors open/closed also includes photoetch parts. Markings for a single tank.